Dodge 1989 G360 Covered in Oil

I have a 1989 Dodge D250 with a Cummins diesel 2WD

Question: Recently picked up an old dodge D250 and the tranny works fine but is covered in oil and I'm looking into either just replacing the seals, and rebuilding the whole thing while I have time and funds right now, or purchasing a replacement. Any recommendations? I don't really plan on hauling anything I just want to attend to any issues now rather than wait for something to break. I live in California how much is shipping to have a rebuilt one sent (I have my own forklift if that changes anything)

Answer:  Your new truck has a Getrag 360 transmission widely used between 1989 and 1993 by Dodge behind the Cummins Diesel engine. You have a couple of options, the first is to overhaul the G360 (assuming the case is not cracked), the second option is to replace the G360 with the later model 5 speed the NV4500 (includes all the latest updates).If you elect to overhaul the existing G-360 unit you will need:

• Bearing Rebuild kit order our part number TRSBK261WS your cost for this kit is $307.67, plus about $20.00 S&H, kit includes all major bearings, gaskets, seals and syncro rings.

If you elect to upgrade to a NV4500 order our part number MTCRY009 your cost is $1667.67 plus core deposit of $500.00 plus freight. You can avoid the core deposit by sending in your existing transmission first (case cannot be broken). This transmission will have a 12 month warranty. If you would like to see the other parts we can provide for the G360 check out our site.